HP 71B

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HP 71B
HP 71B.jpg
Other namesHP 44A (during development)
TypePocket computer, scientific calculator
Introduced1983
Discontinued1989
PredecessorHP 75
SuccessorHP 94, HP 95LX
Cost550 USD
Calculator
Entry modeAlgebraic
Display typeDot-matrix LCD
CPU
ProcessorHP Saturn 1LF2 or HP Saturn 1LK7
Frequency640kHz
Programming
Interfaces
Ports4x ROM/RAM slots, 1x card reader/ROM/RAM header, 1x HP-IL/ barcode reader module slots
Other
Power supply4x AAA battery or 8VAC power supply

The HP 71B is a pocket computer and scientific calculator produced by Hewlett Packard.

Features[edit | edit source]

Internal design[edit | edit source]

Internally, the HP 71B is divided up into two separate boards, earlier models use a ribbon cable to connect the boards, while later models use a zebra strip. The upper board contains the Saturn microprocessor, keyboard, and display. The lower board contains the power supply hardware, ROM, RAM, and expansion slots.

Programming[edit | edit source]

By default, the 71B only supports programming in the BASIC language. Additional keywords can be added to BASIC through the use of an expansion ROM module.

Support for Forth can be added through the use of the Forth/Assembler expansion ROM module.

Sample BASIC program[edit | edit source]

This is a sample program which will play a tone on the buzzer for 0.5 seconds, then increase the frequency non linearly and repeat, while displaying the frequency being played.

10 X=10
20 Y=20
30 PRINT X
40 BEEP X
50 X=X+Y
60 Y=Y+5
70 GOTO 30

Accessories[edit | edit source]

Front expansion slots[edit | edit source]

  • HP 4K RAM module (HP 82420A)
  • CMT RAM modules
  • CMT EPROM module
  • Various ROM modules by HP and others

Rear expansion slot[edit | edit source]

  • HP-IL interface (HP 82401A)
  • Dual HP-IL interface (HP 82402A)
  • Zenwand-71 barcode reader

Card reader slot[edit | edit source]

  • Magnetic card reader (HP 82400A)
  • FRAM71
  • HHP 71RAM/EPROM modules
  • CMT RAM/EPROM modules

Gallery[edit | edit source]

External resources[edit | edit source]

See also[edit | edit source]